Evaluation of chromogenic media for the isolation of vancomycin-resistant enterococci from stool samples.

Abstract:

AIMS:This study sought to evaluate the performance of two chromogenic media designed for the isolation of vancomycin-resistant enterococci (VRE) and compare them with a traditional bile-esculin medium for the isolation of VRE from stool samples. METHODS AND RESULTS:A total of 285 stool samples were inoculated onto Chromogenic VRE Agar (AES VRE agar; AES Chemunex), chromID VRE (bioMérieux) and VRE Agar (Oxoid) both directly and also following broth enrichment. In total 18 strains of vancomycin-resistant Enterococcus faecium were recovered, including 17 harbouring the vanA gene and one with vanB. On direct culture, the sensitivity of the three media was 66.7%, 77.8% and 44.4% and after broth enrichment 66.7%, 83.3% and 77.8% using AES VRE Agar, chromID VRE and Oxoid VRE Agar respectively. CONCLUSIONS:All three media are useful tools for the isolation of VRE from stool samples. AES VRE Agar and bioMérieux chromID VRE are easier to use than Oxoid VRE Agar due to diffusion of black coloration from the latter. SIGNIFICANCE AND IMPACT OF THE STUDY:This is the first study to evaluate the performance of AES VRE Agar and the first to compare two media containing synthetic chromogens for the isolation of VRE.

journal_name

Lett Appl Microbiol

authors

Asir K,Wilkinson K,Perry JD,Reed RH,Gould FK

doi

10.1111/j.1472-765X.2008.02517.x

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

230-3

issue

2

eissn

0266-8254

issn

1472-765X

pii

LAM2517

journal_volume

48

pub_type

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